Microwave oven



FIG. 1 is a perspective view of the microwave oven showing my new design;

FIG. 2 is a front elevational view thereof with the door open;

FIG. 3 is a front elevational view thereof with the door closed;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is a right side elevational view thereof with the left side elevational view being a mirror image thereof. 

The ornamental design for a microwave oven, as shown and described. 